An optical system for an endoscope includes an objective and a reversal system arranged after the objective. The reversal system includes at least one reversal stage for projecting the distal intermediate image as a proximal intermediate image into a proximal intermediate image plane. The reversal system imprints on the proximal intermediate image a first longitudinal chromatic aberration referred to a predetermined wavelength from the visible spectrum and a predetermined wavelength from the near infrared range. The objective imprints on the distal intermediate image a second longitudinal chromatic aberration referred to the predetermined wavelength from the visible spectrum and the predetermined wavelength from the near infrared range. The second longitudinal chromatic aberration has the opposite sign relative to the first longitudinal chromatic aberration, which reduces the longitudinal chromatic aberration caused by the reversal system in the proximal intermediate image.

Provided is a medical imaging device comprising: a color separation prism that has a dichroic film configured to split light into first light belonging to a visible light wavelength band and second light belonging to a fluorescence wavelength band; a fluorescence image sensor that is provided at an output side of the color separation prism and that is configured to image at least part of the second light belonging to the fluorescence wavelength band separated by the dichroic film; a visible light image sensor that is provided at the output side of the color separation prism and that is configured to image at least part of the first light belonging to the visible light wavelength band separated by the dichroic film; and a bandpass filter that is disposed between the color separation prism and the fluorescence image sensor, wherein the fluorescence image sensor and the visible light image sensor are arranged such that an optical path difference between an optical path length of a fluorescence optical path for the second light imaged on the fluorescence image sensor via the color separation prism and an optical path length of a visible light optical path for the first light imaged on the visible light image sensor via the color separation prism corresponds to an amount of a shift between a fluorescence imaging position and a visible light imaging position, the shift being generated by an imaging lens positioned at an input side of the color separation prism, and wherein the fluorescence imaging position is an imaging position of filtered second light, which results from passing the second light through the bandpass tiller, such that tlic amoiuu of shifl is based on the filtered second light.

Provided is a medical imaging device comprising: a color separation prism that has a dichroic film configured to split light into first light belonging to a visible light wavelength band and second light belonging to a fluorescence wavelength band; a fluorescence image sensor that is provided at an output side of the color separation prism and that is configured to image at least part of the second light belonging to the fluorescence wavelength band separated by the dichroic film; a visible light image sensor that is provided at the output side of the color separation prism and that is configured to image at least part of the first light belonging to the visible light wavelength band separated by the dichroic film; and a bandpass filter that is disposed between the color separation prism and the fluorescence image sensor, wherein the fluorescence image sensor and the visible light image sensor are arranged such that an optical path difference between an optical path length of a fluorescence optical path for the second light imaged on the fluorescence image sensor via the color separation prism and an optical path length of a visible light optical path for the first light imaged on the visible light image sensor via the color separation prism corresponds to an amount of a shift between a fluorescence imaging position and a visible light imaging position, the shift being generated by an imaging lens positioned at an input side of the color separation prism, and wherein the fluorescence imaging position is an imaging position of filtered second light, which results from passing the second light through the bandpass tiller, such that tlic amoiuu of shifl is based on the filtered second light.

A relay optical system for a rigid endoscope has two identically formed lens systems which are arranged symmetrically to each other with respect to a plane of symmetry that is perpendicular to the optical axis. The lens systems each comprise a first biconvex lens, a biconcave lens, a rod lens having a convex lens surface facing the plane of symmetry and a concave lens surface facing away from the plane of symmetry, and a second biconvex lens, in this order as viewed from the plane of symmetry.

A relay optical system for a rigid endoscope has two identically formed lens systems which are arranged symmetrically to each other with respect to a plane of symmetry that is perpendicular to the optical axis. The lens systems each comprise a first biconvex lens, a biconcave lens, a rod lens having a convex lens surface facing the plane of symmetry and a concave lens surface facing away from the plane of symmetry, and a second biconvex lens, in this order as viewed from the plane of symmetry.

Improved fluoresced imaging (FI) endoscope devices and systems are provided to enhance use of endoscopes with FI and visible light capabilities. An endoscope device is provided for endoscopy imaging in a white light and a fluoresced light mode. A chromatic adjustment assembly, typically implemented with prisms, compensates for a chromatic focal difference between the white light image and the fluoresced light image caused by the dispersive properties of the optical materials or optical design employed in the construction of the optical channel. The assembly is placed optically between the most proximal rod lens of the endoscope and the focusing optics, typically at an internal telecentric image space, to improve the chromatic correction. The prism assembly directs incoming light with different spectral content along separate paths which compensate for chromatic aberration.

Improved fluoresced imaging (FI) endoscope devices and systems are provided to enhance use of endoscopes with FI and visible light capabilities. An endoscope device is provided for endoscopy imaging in a white light and a fluoresced light mode. A chromatic adjustment assembly, typically implemented with prisms, compensates for a chromatic focal difference between the white light image and the fluoresced light image caused by the dispersive properties of the optical materials or optical design employed in the construction of the optical channel. The assembly is placed optically between the most proximal rod lens of the endoscope and the focusing optics, typically at an internal telecentric image space, to improve the chromatic correction. The prism assembly directs incoming light with different spectral content along separate paths which compensate for chromatic aberration.

A high-resolution and compact endoscopic apparatus is provided. The endoscopic apparatus comprises: an insertion unit configured to be inserted into a body cavity and guide light from an object; an illumination device attached to the insertion unit and illuminating the object; and an imaging device comprising 8K-level or higher-level pixels arranged in a matrix form. The imaging device receives light reflected from the object and guided through the insertion unit and outputs image data of the object. The pitch of the pixels of the imaging device is equal to or larger than the longest wavelength of illumination light emitted from the illumination means.

Described are various embodiments of micro-optical surgical probes and micro-optical probe tips and methods of manufacture therefor. In some embodiments, multichannel micro-optical probe tip structures are directly manufactured upon respective optical channel waveguides, or again manufactured to integrally define respective optical coupling to these waveguides. In some embodiments, micro-optical probe tip structures are manufactured via a 3D laser printing process. Specific embodiments include, but are not limited to, spectroscopic or particularly Raman spectroscopy probes and their associated multichannel probe tip structures, and multichannel endoscopes.

Described are various embodiments of micro-optical surgical probes and micro-optical probe tips and methods of manufacture therefor. In some embodiments, multichannel micro-optical probe tip structures are directly manufactured upon respective optical channel waveguides, or again manufactured to integrally define respective optical coupling to these waveguides. In some embodiments, micro-optical probe tip structures are manufactured via a 3D laser printing process. Specific embodiments include, but are not limited to, spectroscopic or particularly Raman spectroscopy probes and their associated multichannel probe tip structures, and multichannel endoscopes.